If being an art critic sounds cushy - all swanning about pre- opened museums, muscadet in hand - spare a thought for the group that huddled together in the Royal Academy last week. Pressed for time, hanging staff had not yet labelled the works in the RA's latest show, "1900: Art at the Crossroads". The same expression haunted every face. Those apple-green bathers were obviously by Cezanne, the homoerotic youths by Henry Scott Tuke: but whose were the small boys skinny-dipping by moonlight? And that naked woman, walking through undergrowth in a red bandeau? When Academy staff helpfully whispered that the first was by PS Kroyer and the second Anders Zorn, no-one was any the wiser. …